The codes are planet pal 1235431
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if you have an action replay there are cheat codes for it
Check out this link for cheat codes for Reading Express: http://www.cheatcc.com/ds/brainageexpressartsandletterscheatscodes.html
There is no built-in way to add cheat codes for New Super Mario Bros, but you can buy an Action Replay DS Hacking Device for $20 and add cheat codes for almost any DS game. I added a link to the Action Replay website as well as some codes you can use for it once you get it.
yes there are cheat codes if you go on to www.i-cheat.com it will tell you cheat codes for all the games avialable for DS, including Pokemon pearl.
i don't think you can!